Sur d’autres sites (10852)

• ffmpeg with many input and filters

  11 novembre 2017, par Nabi K.A.Z.

  I use this command :

  ffmpeg -i main.mp3 -i 1.mp3 -i 2.mp3 -i 3.mp3 \
  
         -filter_complex "\
  
            [0]volume=1[a0]; \
  
            [1]adelay=1000[a1]; \
  
            [2]adelay=2000[a2]; \
  
            [3]adelay=3000[a3]; \
  
            [a0][a1][a2][a3]amix=4:duration=first" \
  
  -y merged.mp3

  But I have many input. more than 500. so my pattern is be like this :

  ffmpeg -i main.mp3 -i 1.mp3 -i 2.mp3 -i 3.mp3 ... [n.mp3] \
  
         -filter_complex "\
  
            [0]volume=1[a0]; \
  
            [1]adelay=1000[a1]; \
  
            [2]adelay=2000[a2]; \
  
            [3]adelay=3000[a3]; \
  
            :
  
            :
  
            [n]adelay=1000000[aN]; \
  
            [a0][a1][a2][a3] ... [aN] amix=[n]:duration=first" \
  
  -y merged.mp3

  But I get errors in any platform.

  Linux :

  :
  
  :
  
  Input #200, mp3, from 'sounds2/200.mp3':
  
    Metadata:
  
      encoder         : Lavf56.25.101
  
    Duration: 00:00:02.95, start: 0.069063, bitrate: 24 kb/s
  
      Stream #200:0: Audio: mp3, 16000 Hz, mono, s16p, 24 kb/s
  
  [amix @ 0x3cffb20] Value 201.000000 for parameter 'inputs' out of range [1 - 32]
  
      Last message repeated 1 times
  
  [amix @ 0x3cffb20] Error setting option inputs to value 201.
  
  [Parsed_amix_201 @ 0x3cffa60] Error applying options to the filter.
  
  [AVFilterGraph @ 0x3b44980] Error initializing filter 'amix' with args '201:duration=first'
  
  Error configuring filters.

  Cygwin :

    Stream #199:0 (mp3) -> adelay
  
    Stream #200:0 (mp3) -> adelay
  
    amix -> Stream #0:0 (aac)
  
  Press [q] to stop, [?] for help
  
  [Parsed_adelay_171 @ 00000000041fc0c0] Failed to configure input pad on Parsed_adelay_171
  
  Error reinitializing filters!
  
  Failed to inject frame into filter network: Cannot allocate memory
  
  Error while processing the decoded data for stream #200:0
  
  Conversion failed!

  Windows :

  The command line is too long.

  What’s your solution ?

• python cv2 BackgroundSubtractor imshow function error

  16 septembre 2017, par Vincent Yuan

  problem

  I want to detect the motional object in a video, but the cap seems not to read the video. I use conda jupyter and have install the ffmpeg with brew and I use macOS. Still, I am unable to capture the video.

  code :

  import numpy as np
  
  import cv2
  
  import time
  
  
  
  cap = cv2.VideoCapture('test.avi')
  
  time.sleep(2)
  
  fgbg = cv2.createBackgroundSubtractorKNN(detectShadows=True)
  
  
  
  while(1):
  
  ret, frame = cap.read()
  
  
  
  fgmask = fgbg.apply(frame)
  
  
  
  cv2.imshow('original',frame)
  
  cv2.imshow('fg',fgmask)
  
  
  
  k = cv2.waitKey(30) & 0xff
  
  for c in contours:
  
          # 获取矩形框边界坐标
  
          x, y, w, h = cv2.boundingRect(c)
  
          # 计算矩形框的面积
  
          area = cv2.contourArea(c)
  
          if 500 < area < 3000:
  
              cv2.rectangle(frame, (x, y), (x + w, y + h), (0, 255, 0), 2)
  
  
  
  cv2.imshow("detection", frame)
  
  cv2.imshow("back", dilated)
  
  
  
  
  
  if k == 27:
  
      break
  
  
  
  
  
  cap.release()
  
  cv2.destroyAllWindows()

  error

  Couldn’t read video stream from file "test.avi"

• GStreamer x264 on Linux (ARM)

  8 septembre 2017, par Tõnu Samuel

  Trying to get streaming work with x264 encoding.

  I am doing some black magic with stitching two images which is known to work :

  gst-launch-1.0 -e \
  
      v4l2src device=/dev/video0 ! \
  
          video/x-raw,framerate=90/1,width=640,height=480 ! m.sink_0 \
  
      v4l2src device=/dev/video1 ! \
  
          video/x-raw,framerate=90/1,width=640,height=480 ! m.sink_1 \
  
      videomixer name=m sink_1::xpos=640 ! \
  
      video/x-raw,framerate=90/1,width=1280,height=480 ! \
  
      xvimagesink

  Now I am trying to get same thing over x264 stream with help of internet :

  gst-launch-1.0 -e \
  
      v4l2src device=/dev/video0 ! \
  
          video/x-raw,framerate=90/1,width=640,height=480 ! m.sink_0 \
  
      v4l2src device=/dev/video1 ! \
  
          video/x-raw,framerate=90/1,width=640,height=480 ! m.sink_1 \
  
      videomixer name=m sink_1::xpos=640 ! \
  
      video/x-raw,framerate=90/1,width=1280,height=480 ! \
  
      x264enc tune=zerolatency byte-stream=true bitrate=3000 threads=2 ! \
  
      h264parse config-interval=1 ! \
  
      rtph264pay ! \
  
      udpsink host=127.0.0.1 port=5000 

  And seems to work because no errors appear. But I see no way to receive image.

  I have tried

  gst-launch-1.0 udpsrc port=5000 ! application/x-rtp ! rtph264depay ! h264parse ! avdec_h264 ! xvimagesink

  which does not provide anything useful. Also attempted to use VLC with SDP file :

  c=IN IP4 127.0.0.1
  
  m=video 5000 RTP/AVP 96
  
  a=rtpmap:96 H264/3000

  I must be doing something wrong but unsure what.

  EDIT : Question about version of GStreamer. Probably this is information needed :

  ubuntu@tegra-ubuntu:~$  gst-launch-1.0 --version
  
  gst-launch-1.0 version 1.2.4
  
  GStreamer 1.2.4
  
  https://launchpad.net/distros/ubuntu/+source/gstreamer1.0
  
  ubuntu@tegra-ubuntu:~$
  
  
  
  
  
  
  
  $ dpkg -l | grep gstreamer
  
  ii  gir1.2-gstreamer-1.0                                  1.2.4-0ubuntu1.1                                    armhf        Description: GObject introspection data for the GStreamer library
  
  ii  gstreamer-tools                                       0.10.36-1.2ubuntu3                                  armhf        Tools for use with GStreamer
  
  ii  gstreamer0.10-alsa:armhf                              0.10.36-1.1ubuntu2                                  armhf        GStreamer plugin for ALSA
  
  ii  gstreamer0.10-fluendo-mp3:armhf                       0.10.23.debian-3                                    armhf        Fluendo mp3 decoder GStreamer 0.10 plugin
  
  ii  gstreamer0.10-nice:armhf                              0.1.4-1                                             armhf        ICE library (GStreamer 0.10 plugin)
  
  ii  gstreamer0.10-plugins-bad:armhf                       0.10.23-7.2ubuntu1.3                                armhf        GStreamer plugins from the "bad" set
  
  ii  gstreamer0.10-plugins-bad-multiverse                  0.10.21-1ubuntu3                                    armhf        GStreamer plugins from the "bad" set (Multiverse Variant)
  
  ii  gstreamer0.10-plugins-base:armhf                      0.10.36-1.1ubuntu2                                  armhf        GStreamer plugins from the "base" set
  
  ii  gstreamer0.10-plugins-base-apps                       0.10.36-1.1ubuntu2                                  armhf        GStreamer helper programs from the "base" set
  
  ii  gstreamer0.10-plugins-good:armhf                      0.10.31-3+nmu1ubuntu5.2                             armhf        GStreamer plugins from the "good" set
  
  ii  gstreamer0.10-plugins-ugly:armhf                      0.10.19-2ubuntu5                                    armhf        GStreamer plugins from the "ugly" set
  
  ii  gstreamer0.10-pulseaudio:armhf                        0.10.31-3+nmu1ubuntu5.2                             armhf        GStreamer plugin for PulseAudio
  
  ii  gstreamer0.10-tools                                   0.10.36-1.2ubuntu3                                  armhf        Tools for use with GStreamer
  
  ii  gstreamer0.10-x:armhf                                 0.10.36-1.1ubuntu2                                  armhf        GStreamer plugins for X11 and Pango
  
  ii  gstreamer1.0-alsa:armhf                               1.2.4-1~ubuntu2                                     armhf        GStreamer plugin for ALSA
  
  ii  gstreamer1.0-clutter                                  2.0.8-1build1                                       armhf        Clutter PLugin for GStreamer 1.0
  
  ii  gstreamer1.0-fluendo-mp3:armhf                        0.10.23.debian-3                                    armhf        Fluendo mp3 decoder GStreamer 1.0 plugin
  
  ii  gstreamer1.0-libav:armhf                              1.2.4-1~ubuntu1                                     armhf        libav plugin for GStreamer
  
  ii  gstreamer1.0-nice:armhf                               0.1.4-1                                             armhf        ICE library (GStreamer plugin)
  
  ii  gstreamer1.0-plugins-bad:armhf                        1.2.4-1~ubuntu1.1                                   armhf        GStreamer plugins from the "bad" set
  
  ii  gstreamer1.0-plugins-bad-faad:armhf                   1.2.4-1~ubuntu1.1                                   armhf        GStreamer faad plugin from the "bad" set
  
  ii  gstreamer1.0-plugins-bad-videoparsers:armhf           1.2.4-1~ubuntu1.1                                   armhf        GStreamer videoparsers plugin from the "bad" set
  
  ii  gstreamer1.0-plugins-base:armhf                       1.2.4-1~ubuntu2                                     armhf        GStreamer plugins from the "base" set
  
  ii  gstreamer1.0-plugins-base-apps                        1.2.4-1~ubuntu2                                     armhf        GStreamer helper programs from the "base" set
  
  ii  gstreamer1.0-plugins-good:armhf                       1.2.4-1~ubuntu1.3                                   armhf        GStreamer plugins from the "good" set
  
  ii  gstreamer1.0-plugins-ugly:armhf                       1.2.3-2build1                                       armhf        GStreamer plugins from the "ugly" set
  
  ii  gstreamer1.0-pulseaudio:armhf                         1.2.4-1~ubuntu1.3                                   armhf        GStreamer plugin for PulseAudio
  
  ii  gstreamer1.0-tools                                    1.2.4-0ubuntu1.1                                    armhf        Tools for use with GStreamer
  
  ii  gstreamer1.0-x:armhf                                  1.2.4-1~ubuntu2                                     armhf        GStreamer plugins for X11 and Pango
  
  ii  libgstreamer-plugins-bad0.10-0:armhf                  0.10.23-7.2ubuntu1.3                                armhf        GStreamer shared libraries from the "bad" set
  
  ii  libgstreamer-plugins-bad1.0-0:armhf                   1.2.4-1~ubuntu1.1                                   armhf        GStreamer development files for libraries from the "bad" set
  
  ii  libgstreamer-plugins-base0.10-0:armhf                 0.10.36-1.1ubuntu2                                  armhf        GStreamer libraries from the "base" set
  
  ii  libgstreamer-plugins-base1.0-0:armhf                  1.2.4-1~ubuntu2                                     armhf        GStreamer libraries from the "base" set
  
  ii  libgstreamer-plugins-good1.0-0:armhf                  1.2.4-1~ubuntu1.3                                   armhf        GStreamer development files for libraries from the "good" set
  
  ii  libgstreamer0.10-0:armhf                              0.10.36-1.2ubuntu3                                  armhf        Core GStreamer libraries and elements
  
  ii  libgstreamer1.0-0:armhf                               1.2.4-0ubuntu1.1                                    armhf        Core GStreamer libraries and elements
  
  $